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'80 924 Buzz = Low Idle Speed

Engine

Vehicle Information: Year: 1980; Engine (type, size, modifications): 2.0; Total Mileage: 75000;

Problems begin at startup - idle is low for a few minutes, then improves. Have already replaced the cold start valve and warm-up regulator.Once the car has been running a few minutes and the idle is fine, suddenly a buzz starts near the fuel lines / fuel distributor and the idle drops; must give it throttle to keep from stalling. I'll rev the engine to 2500rpm for 5 to 10 seconds and the buzzing stops and idle returns to normal. Wait a few minutes and it starts all over again.Thanks

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